Hi -
Perhaps you can contact the local police precinct about this so that they can go and visit the guy to talk. In the process, they may find something else to get him on; ie: weapons, assault.
Also, if he starts to harass or intimidate you or your girlfriend, you may want to consider using this Cease and Desist Letter/Order:
[
www.crcnyc.net]
Here are the Oregon state harassment/stalking laws:
[
www.ncvc.org]
It was used successfully on a number of occasions against the Opus Dei cult in New York City. Also, it would establish a paper trail so that if he keeps doing it, giving you grounds to have him arrested on harassment charges.